ok so i just got home from work its 4 in the morning and i havent drove my car in 2 days, its been pretty cold.....so i went out to start it and it started hard....but started, so i let it run for like 10 min, shut it off....i wanted to start it back up because my battery seemed week and i want to see if it would start again, turned it over and nothing........just cranks.....any suggestions?